diff --git a/grep/generate_files_with_problematic_names b/grep/generate_files_with_problematic_names
index 070ae8e..d31b58e 100644
--- a/grep/generate_files_with_problematic_names
+++ b/grep/generate_files_with_problematic_names
@@ -33,5 +33,6 @@ echo "fwpn:newline as separator:mayer" > "newline_as
 separator.txt"
 echo "fwpn:tabulator as separator:mayr" > tabulator_as$'\t'separator.txt
 echo "fwpn:with questionmark:meier" > with_?.txt
+echo "fwpn:collon:meyer" > with_:.txt
 
 exit 0
\ No newline at end of file